The 1.3l motor parts are just about impossible to find. I'm the proud owner of a rust free 84 dx1300 chassis that has been swapped to a 1.5l fuel injected motor. The previous owner was unable to complete a motor rebuild and sold me the chassis super cheap.
There is lots of information over at red pepper racing. Here's a swap thread that you may find interesting.
87 Civic Si D Series Swap - Red Pepper Racing
Here's my build thread for info regarding rust, carb to efi swaps, etc.
http://www.redpepperracing.com/forum...mine%27s+worse